Heartwarming & Sentimental:
* Mama's Goodnight Song
* Always My Little Boy
* The Bedtime Story That Never Ends
* Love Never Grows Old
* Goodnight, My Love
Playful & Whimsical:
* Mom's Got Your Back, Even When You're Tall
* The Never-Ending Bedtime Routine
* Goodnight, Big Guy
* From Tiny Tot to Old Man, Mom's Always There
* A Lifetime of Goodnight Kisses
More Direct & Straightforward:
* Mom's Love: A Lifetime of Bedtime Stories
* The Boy Who Never Grew Up (In Mom's Eyes)
* A Mother's Love: A Story About Growing Old
* Goodnight, Son
For a more unique twist, you can use these options:
* The Moon's Still Shining (referencing the time of night)
* The Pillow That Never Gets Too Big (a playful take on the son growing)
* The Last Goodnight (implies a bittersweet ending, but still hopeful)
Ultimately, the best title will depend on the specific tone and message of your book.